Well... I used some 'Thimb Screws' obtained from a local hardware store.
You'd be suprised what you can order. You can most likely order something near identicle in Stainless.
I went with stuff they had in stock. No photos that would show, but Black Plastic 'Grip' about 1 1/4" Diameter, about 1/2" Thick total height.
They look good on it, and are easy to crank in and out.
I think the threads on the originals are a spiral cork screw lookin type,
The ones I got are a Course thread.... fairly standard and much much closer together, but work great.
Food for thought.... even if not permanant.... works if you need something quick.
And they were cheap. $1.00-1.50 each